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R3D2

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NORAD ID: 44073
Int'l Code: 2019-016 A
Perigee: 372.1 km
Apogee: 381.7 km
Inclination: 39.5 °
Period: 91.9 minutes
Semi major axis: 6747 km
RCS: Unknown
Launch date: February 28, 2019
Source: United States (US)
Launch site: Rocket Lab Launch Complex (RLLC)

R3D2 (Radio Frequency Risk Reduction Deployment Demonstration) is a DARPA mission to space-qualify a new type of membrane reflectarray antenna. The antenna, made of a tissue-thin Kapton membrane, packs tightly for stowage during launch and then will deploy to its full size of 2.25 meters in diameter once it reaches low Earth orbit.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 44073U 19016A   21023.46371304  .00043846  00000-0  41231-3 0  9990
2 44073  39.5117 295.6066 0007144 229.0053 131.0137 15.66204741103564
Source of the keplerian elements: AFSPC